But yeah, I've always been impressed by how detailed and specific their tags were. That's A LOT of work! The power of porn, I guess. And as an added bonus, those tags now power AIs able to generate custom hentai on demand!
Unfortunately, since their tags are so abundant, most of them (mainly the "too specific" ones) are far from exhaustive/complete in term of being actually used. And things like hair colors are extremely subjective so you're not sure if an image is going to be tagged as brown_hair or red_hair.
If you want to find some images by tags, you better stick with more generic ones.